Head separation on my brass

[Unoboats]

If you look real close to the 280 ai brass it's factory loads and showing a slight etched ring uniformly3/4" above the base of the cartridge.
the 308 brass has been shot 3 times.
It was loaded on my bench. The brass that was purchased for loading has not shown this issue, but reloaded factory ammo does. What's up ??
Chip

 

[elkaholic]

View attachment 180927
If you look real close to the 280 ai brass it's factory loads and showing a slight etched ring uniformly3/4" above the base of the cartridge.
the 308 brass has been shot 3 times.
It was loaded on my bench. The brass that was purchased for loading has not shown this issue, but reloaded factory ammo does. What's up ??
Chip

Normally that indicates excessive headspace. If you have some unfired brass, use a bump gauge to check and then check brass thats been fired in your chamber.
How far did you bump the shoulder when you reloaded the 308?

 

[Unoboats]

5 thousands

 

[Unoboats]

All the Ackley brass was new Hornady loads.
Precision Hunter

 

[elkaholic]

5 thousands

Factory brass can be that much but I only bump .002" when reloading. .005" shouldn't be enough to cause separation though?
Do you have a saami chamber on the A.I.

 

[Unoboats]

Kimber Subalpine. It's SAMI supposedly.
the 308 is a Stock Rem 700

 

[elkaholic]

Kimber Subalpine. It's SAMI supposedly.
the 308 is a Stock Rem 700

I dont have answer I guess, but that normally is a sure sign of excessive head space!
Very odd that its happening on both cartridges??
Did the ring on the 280 appear when you first fired the facory load?

 

[Unoboats]

I know have never seen it before in new ammo, maybe I'm holding it too tight, LOL

 

[Unoboats]

Yes the ring appeared after firing the ammo for the first time.

 

[elkaholic]

Yes the ring appeared after firing the ammo for the first time.

Do you have any still unfired? If so, I would pull the bullet and check head space on it against your fired brass.

 

[Unoboats]

I can on the reloaded 308

 

[ButterBean]

The last two batches of Hornady Brass that I have worked up was terrible and did the same thing in my 308 with .001 bump, IMO Hornady brass is now on the same level as Federal brass, It's a shame it was good stuff at one time

 

[Unoboats]

.008 difference on the 308's
.0015 difference on the 280 AI

 

[Unoboats]

The last two batches of Hornady Brass that I have worked up was terrible and did the same thing in my 308 with .001 bump, IMO Hornady brass is now on the same level as Federal brass, It's a shame it was good stuff at one time

I think I have to agree with you , just ordered some Nosler custom brass for the 280AI and Lapua on the 308